117925921 has 4 divisors (see below), whose sum is σ = 118361344. Its totient is φ = 117490500.

The previous prime is 117925897. The next prime is 117925931. The reversal of 117925921 is 129529711.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 129529711 = 37 ⋅3500803.

It is a cyclic number.

It is not a de Polignac number, because 117925921 - 2¹¹ = 117923873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (117925931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 217305 + ... + 217846.

It is an arithmetic number, because the mean of its divisors is an integer number (29590336).

Almost surely, 2^117925921 is an apocalyptic number.

It is an amenable number.

117925921 is a deficient number, since it is larger than the sum of its proper divisors (435423).

117925921 is an equidigital number, since it uses as much as digits as its factorization.

117925921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 435422.

The product of its digits is 11340, while the sum is 37.

The square root of 117925921 is about 10859.3701935241. The cubic root of 117925921 is about 490.3841510654.

The spelling of 117925921 in words is "one hundred seventeen million, nine hundred twenty-five thousand, nine hundred twenty-one".